[Plunderin Mom]

I have found that, if you dig and it searches but says, "no items found" (or something similar), that if you continue to dig in that spot it will eventually give up the item. The same holds true for the rum on rumrunners that you have to dig up.

A couple of places on tortuga that aren't as well known are the spot on the hill to the right of the Graveyard entrance, and one near the swamp to the left of the island.